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37 * \brief Implements the DeviceStream for CUDA.
39 * \author Artem Zhmurov <zhmurov@gmail.com>
41 * \ingroup module_gpu_utils
45 #include "device_stream.h"
47 #include "gromacs/gpu_utils/cudautils.cuh"
48 #include "gromacs/utility/exceptions.h"
49 #include "gromacs/utility/gmxassert.h"
50 #include "gromacs/utility/stringutil.h"
52 DeviceStream::DeviceStream(const DeviceContext& /* deviceContext */,
53 DeviceStreamPriority priority,
54 const bool /* useTiming */)
58 if (priority == DeviceStreamPriority::Normal)
60 stat = cudaStreamCreate(&stream_);
61 gmx::checkDeviceError(stat, "Could not create CUDA stream.");
63 else if (priority == DeviceStreamPriority::High)
65 // Note that the device we're running on does not have to
66 // support priorities, because we are querying the priority
67 // range, which in that case will be a single value.
69 stat = cudaDeviceGetStreamPriorityRange(nullptr, &highestPriority);
70 gmx::checkDeviceError(stat, "Could not query CUDA stream priority range.");
72 stat = cudaStreamCreateWithPriority(&stream_, cudaStreamDefault, highestPriority);
73 gmx::checkDeviceError(stat, "Could not create CUDA stream with high priority.");
77 DeviceStream::~DeviceStream()
81 cudaError_t stat = cudaStreamDestroy(stream_);
82 GMX_RELEASE_ASSERT(stat == cudaSuccess,
83 ("Failed to release CUDA stream. " + gmx::getDeviceErrorString(stat)).c_str());
88 cudaStream_t DeviceStream::stream() const
93 bool DeviceStream::isValid() const
95 return (stream_ != nullptr);
98 void DeviceStream::synchronize() const
100 cudaError_t stat = cudaStreamSynchronize(stream_);
101 GMX_RELEASE_ASSERT(stat == cudaSuccess,
102 ("cudaStreamSynchronize failed. " + gmx::getDeviceErrorString(stat)).c_str());